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Avalon AD-2055 - Parametric Equalizer Used  From Avalon

Wide Open, sonically spectacular, incredibly detailed, and very controllable EQ from Avalon Design


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Avalon Design

Discontinued, No Longer Available

This item has been discontinued and is no longer available. Sometimes we will get our hands on a leftover or used unit.

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What We Think

The air on the top end of this thing just keeps going. Few EQ's available at any price can give a mix a more open feel. Like the other 2000-series boxes, the incredible detail, transparency, and accuracy that the 2055 EQ presents is truly a remarkable achievement. A number of great engineers have referred to the Avalon 2000-series as the "ultimate tracking channel" consisting of the Avalon AD2022 preamp, the 2044 compressor, and this incredible EQ. The 2000-series is a must have for any studio who wants to compete

Manufacturer's Description from Avalon

The AD2055 combines 100% discrete, pure class A signal amplifiers with state-of- the-art passive and active filter topologies. The AD2055's unique circuitry delivers very high resolution transient detail at the operational extremes of real world equalization demands. The AD2055 auto-bias DC servo loop control eliminates the need for all interstage capacitor coupling. The AD2055 breathes life into all musical performances!


  • Pure Class A, 100% discrete design
  • Smooth musical detail and sonic excellence
  • Minimum audio signal path
  • Dual mono operation
  • Transparent active and passive filter design
  • High headroom +30dB Very low noise -94dB
  • Fully balanced inputs and outputs
  • DC coupled, no transformers in audio path
  • Switched frequencies in high and low bands
  • Mid bands use X10 frequency for extended range
  • Wide bandwidth -3dB 1Hz to 450kHz
  • Low distortion less than 0.5% THD and IMD
  • All signal routing with sealed silver relays Conductive plastic potentiometers for low noise
  • External 150W toroidal power supply 100% discrete power supplies for audio path
  • Long lasting, stainless steel hardware


The Avalon AD2055 Pure Class A music equalizer is the most powerful, low noise parametric equalizer available today. Designed to optimize absolute signal integrity and musical performance, the AD2055 combines the best of active and passive filter topologies with sonic excellence unequaled by lesser designs. The AD2055 is the perfect solution for two buss music-program equalization, special instrument EQ and FX applications and ultra high performance mastering studio's.

Features include state-of-the-art, balanced 100% discrete, Pure Class A signal amplifiers, practical user features and rugged hardware designed to deliver true high performance audio for many years. 


Avalon equalizers feature the unique combination of both active and passive filter EQ designs. This special combination enables the AD2055 to deliver high speed transient detail at the operational extremes of real-world equalization demands. The passive high and low bands offer alternate musical tone range to the full function active parametric mid bands. Passive equalizers have long been a favorite with music lovers around the world.  Full bodied, powerful (up to +/-32dB, 64dB range !) and sweet frequency selections are the benefits of the passive high-low EQ bands. The full bandwidth twin mid bands provide variable frequency selection (X10 frequency multipliers for very wide range), variable Q (width) and amplitude control. 


Avalon's advanced true symmetry design offers high-voltage, large headroom, extended bandwidth and very low noise. The use of 100% discrete, Pure Class A signal amplifiers give the serious music professional unlimited sonic character and a natural harmonic detail that enhances the program material and becomes one with the music itself. The Avalon AD2055 breathes life!

Avalon Design

About Manufacturer

Wynton R. Morro founded Avalon with the desire to bring the art of music recording closer to the essence of the original performance. Avalon's pure Class A recording systems provide the world's leading engineers, producers and musicians with state-of-the-art electronics designed especially for high-fidelity music and sound recording, These carefully engineered systems enhance the creative senses and become one with the music itself. Avalon systems utilize 100% discrete, high-bias pure Class A audio amplifiers. These pure Class A amplifiers are incorporated into minimal signal path designs which include sealed silver relays, balanced DC coupled high-current "outside-world" drivers, fully discrete linear DC regulators, low noise toroidal power transformers and selected high quality active and passive components. This powerful combination of design features gives increased musical headroom and greater dynamic transient capability for a truly transparent audio passage. Avalon's unique design features, highest quality components and continued pursuit of sonic excellence assures the most harmonious musical signal transfer available today. Whether you are recording a solo vocalist, capturing the delicate nuance of an acoustic instrument, mastering music and film productions or recording symphonies, let Avalon take you to the leading edge in analog and experience sonic reality like never before!




Circuit Topology

High-voltage 100% discrete, balanced and symmetrical Class A

Output Gain Range

Unity Gain

Maximum Input Level

+30dB balanced XLR pin 2 hot

Maximum Output Level

+32dB balanced 600 ohms, DC coupled, high-current discrete Class A

Input / Output Type

XLR type, pin 2 hot balanced

Noise 20kHz Unweighted

-94dB (EQ in)

Distortion THD, IMD

0.5% (typical 0.05% at +6dB 1kHz)

Frequency Response -3dB

1Hz to 450kHz (input band limited)

Equalizer Type

Passive high and low bands plus two fully parametric mid bands


Hard-wire relay bypass for equalizer in-out

Low Band F1

Passive, amplitude to -32dB to +32dB shelf or peak-dip curve

F1 Frequency Range

Switched 10 position 18Hz, 25, 30, 50, 72, 100, 150, 215, 300, 450Hz

Mid Band F2

Active, amplitude to -16dB to +16dB peak-dip curve

F2 Frequency Range

Variable 35Hz to 450Hz (x10) 350Hz to 4k5Hz, Q (width) 0.3 to 3.0

Mid Band F3

Active, amplitude to -16dB to +16dB peak-dip curve

F3 Frequency Range

Variable 160Hz to 2k0Hz (x10) 1k6Hz to 20kHz, Q (width) 0.3 to 3.0

High Band F4

Passive, amplitude to -26dB to +26dB shelf or peak-dip curve

F4 Frequency Range

Switched 10 position 1k5Hz, 2k5, 3k5, 5k, 7k2, 10k, 12k5, 15k, 20k, 25kHz

AC-DC Power

External AC supply, 150w toroidal transformer, 4 pin cable 90v isolated,

(B2T Power Supply Included)

100-240v selectable 50/60Hz, 150w max


19 x 3.5 x 12 in (482 x 88 x 305mm)

Shipping weight

30lbs (13.6 kg)






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